US4339373A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Granulation and drying aids for polymeric gels
Assignee: Wyeth Holdings LLC
•
Filing: 1980-02-06
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Granted: 1982-07-13
•
Expires: 2000-02-06
Abstract
Abstract Polymeric soaps prepared from copolymers of hydrophobic monomers and hydrophilic monomers are useful as granulation and/or drying aids for polymeric gels, especially those gels of polyacrylamide.
Inventors
- 👤 Peter M. Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:03
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/124; C08J2300/00; C08J2300/14
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
82 words
A method of granulating solid polymeric gels containing solids in the amount of about 5 to 75 percent of said gel to form a free flowing powder comprising adding to said solid gel during the granulation an effective amount of an oil solution of a polymeric soap in the range of about 50 to 5000 ppm of polymeric soap based in the polymeric gel, which soap is a copolymer prepared from at least one hydrophobic monomer and at least one hydrophilic monomer.
Claim 2
Independent Claim
82 words
A method of granulating solid polymeric gels containing solids in the amount of about 5 to 75 percent of said gel to form a free flowing powder comprising adding to said solid gel during the granulation an effective amount of an oil solution of a polymeric soap in the range of about 50 to 5000 ppm of polymeric soap based in the polymeric gel, which soap is a copolymer prepared from at least one hydrophobic monomer and at least one hydrophilic monomer.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein said polymeric gel is a homopolymer or copolymer of one or more water-soluble ethylenically unsaturated monomers.
Claim 4
Dependent Claim
39 words
The method of claim 2 wherein said monomers are selected from acrylamide, methacrylamide, acrylic acid, methacrylic acid, salts of acrylic acid and methacrylic acid, and quaternized and unquaternized (neutralised and unneutralised) aminoalkyl esters of acrylic acid and methacrylic acid.
Claim 5
Dependent Claim
39 words
The method of claim 1 wherein the hydrophobic monomer is of the formula ##STR5## wherein R 1 is H or CH 3 and R 2 is a branched or linear hydrocarbon chain with about 4 to 30 carbon atoms.
Claim 6
Dependent Claim
12 words
The method of claim 4 wherein the hydrophobic monomer is stearyl methacrylate.
Claim 7
Dependent Claim
25 words
The method of claim 1 wherein the hydrophilic monomer is anionic and of the formula ##STR6## wherein R 1 is H or CH 3 .
Claim 8
Dependent Claim
52 words
The method of claim 1 wherein the hydrophilic monomer is nonionic and of the formula selected from: ##STR7## wherein R 1 is H or CH 3 , X is NH or O, and A is --CH 2 CH 2 -- n H where n is an integer from about 1 to 20.
Claim 9
Dependent Claim
15 words
The method of claim 7 wherein the nonionic monomer is selected from acrylamide and methacrylamide.
Claim 10
Dependent Claim
57 words
The method of claim 1 wherein the hydrophilic monomer is cationic and of the formula ##STR8## wherein R 1 is H or CH 3 , R 3 and R 4 are independently selected from alkyl with about 1 to 4 carbon atoms, X is NH or O and n is an integer from about 1 to 4.
Claim 11
Dependent Claim
22 words
The method according to claim 9 wherein the cationic monomer is selected from quaternized and unquaternized (neutralised and unneutralised) dimethylaminoethylmethacrylate and diethylaminoethylacrylate.
Claim 12
Dependent Claim
13 words
The method according to claim 1 wherein the oil is a hydrocarbon oil.
Claim 13
Dependent Claim
13 words
The method according to claim 11 wherein the oil is a mineral oil.
Claim 14
Independent Claim
89 words
A method of reducing agglomeration in the drying of granulated solid polymeric gels containing solids in the amount of about 5 to 75 percent of said gels to form a free flowing powder comprising adding to said solid gel prior to said drying an effective amount of an oil solution of a polymeric soap, in the range of about 50 to 5000 ppm of polymeric soap based on the polymeric gel, which soap is a copolymer prepared from at least one hydrophobic monomer and at least one hydrophilic monomer.
Claim 15
Independent Claim
89 words
A method of reducing agglomeration in the drying of granulated solid polymeric gels containing solids in the amount of about 5 to 75 percent of said gels to form a free flowing powder comprising adding to said solid gel prior to said drying an effective amount of an oil solution of a polymeric soap, in the range of about 50 to 5000 ppm of polymeric soap based on the polymeric gel, which soap is a copolymer prepared from at least one hydrophobic monomer and at least one hydrophilic monomer.
Claim 16
Dependent Claim
21 words
The method of claim 13 wherein said polymeric gel is a homopolymer or copolymer of one or more water-soluble ethylenically-unsaturated monomers.
Claim 17
Dependent Claim
39 words
The method of claim 14 wherein said monomers are selected from acrylamide, methacrylamide, acrylic acid, methacrylic acid, salts of acrylic acid and methacrylic acid, and quaternized and unquaternized (neutralised and unneutralised) aminoalkyl esters of acrylic acid and methacrylic acid.
Claim 18
Dependent Claim
39 words
The method of claim 13 wherein the hydrophobic monomer is of the formula ##STR9## wherein R 1 is H or CH 3 and R 2 is a branched or linear hydrocarbon chain with about 4 to 30 carbon atoms.
Claim 19
Dependent Claim
12 words
The method of claim 16 wherein the hydrophobic monomer is stearyl methacrylate.
Claim 20
Dependent Claim
25 words
The method of claim 13 wherein the hydrophilic monomer is anionic and of the formula ##STR10## wherein R 1 is H or CH 3 .
Claim 21
Dependent Claim
52 words
The method of claim 13 wherein the hydrophilic monomer is nonionic and of the formula selected from: ##STR11## wherein R 1 is H or CH 3 , X is NH or O, and A is --CH 2 CH 2 O-- n H where n is an integer from about 1 to 20.
Claim 22
Dependent Claim
15 words
The method of claim 19 wherein the nonionic monomer is selected from acrylamide and methacrylamide.
Claim 23
Dependent Claim
57 words
The method of claim 13 wherein the hydrophilic monomer is cationic and of the formula ##STR12## wherein R 1 is H or CH 3 , R 3 and R 4 are independently selected from alkyl with about 1 to 4 carbon atoms, X is NH or O and n is an integer from about 1 to 4.
Claim 24
Dependent Claim
22 words
The method according to claim 21 wherein the cationic monomer is selected from quaternized and unquaternized (neutralised and unneutralised) dimethylaminoethylmethacrylate and diethylaminoethylacrylate.
Claim 25
Dependent Claim
13 words
The method according to claim 13 wherein the oil is a hydrocarbon oil.
Claim 26
Dependent Claim
13 words
The method according to claim 23 wherein the oil is a mineral oil.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |